docs: move dead-not-skipped (FEAT-1) to TODO backlog, M4 = BUG-5 fix

REWORK_PLAN.md M4 = resolve initiative rotation corruption (BUG-5).
Mid-round add/revive corrupts rotation. RED locked.

TODO.md FEAT-1 = dead participants stay in turn order (user request,
Saturday game). Feature backlog, not milestone.

docs/REWORK_PLAN.md

@@ -119,7 +119,7 @@ Each milestone = independently mergeable PR upstream (unless marked ❌).
 | 1 | build backend (Node+Express+ws+better-sqlite3) | unit tests as built |
 | 2 | frontend WS adapter — app runs vs backend, cross-device works | yes |
 | 3 | characterization tests lock current behavior | yes |
-| 4 | dead participants not skipped (M4 below) | yes |
+| 4 | resolve initiative rotation corruption (BUG-5) | yes |
 | 5 | docker compose in-house | smoke |
 | 6 | undo rework (tx events) | unit |
 | 7 | playwright multi-window e2e (deferred) | e2e |
@@ -159,19 +159,17 @@ Each milestone = independently mergeable PR upstream (unless marked ❌).
 - **Exit criteria:** characterization suite green. Baseline locked. ✅ DONE.
 - **Upstream-PRable:** ✅ if kept storage-agnostic (tests target turn logic shape).
 
-### Milestone 4 — Dead participants stay in turn order
-- **The one feature request:** dead (HP=0) participants must NOT be skipped.
-- Current: dead → `isActive=false` → removed from turn order → skipped.
-- Desired: dead occupy initiative slot, turn still comes up. PCs get
-  death-save turn.
-- Affects: `shared/turn.js` `nextTurn` (filters `isActive`), `applyHpChange`
-  (sets isActive=false on death), `computeTurnOrderAfterRemoval`.
-- Characterization tests (`src/tests/Combat.characterization.test.js`) lock
-  CURRENT behavior — UPDATE to desired when implementing.
-- RED test locked (desired state): `shared/tests/turn.dead-skip.test.js`.
-- Uses M1/M3 characterization as foundation.
-- **Exit criteria:** dead participant turn comes up, RED tests go green.
-- **Upstream-PRable:** ✅ beneficial feature.
+### Milestone 4 — Resolve initiative rotation corruption (BUG-5)
+- **Real bug.** Mid-round add/revive corrupts rotation.
+- 13 dupes / 100 rounds (deterministic seeded test).
+- Root cause: `computeTurnOrderAfterAddition` appends id to turnOrderIds
+  end. Round wrap re-sorts by initiative. `currentTurnParticipantId`
+  pointer stale → nextTurn revisits.
+- RED test locked: `shared/tests/turn.combat.test.js`.
+- Detail in `TODO.md` BUG-5.
+- **Exit criteria:** RED green. Rotation invariant holds across
+  add/remove/revive.
+- **Upstream-PRable:** ✅ bug fix.
 
 ### Milestone 5 — Docker compose
 - `docker-compose.yml`:
@@ -234,7 +232,7 @@ Each milestone = independently mergeable PR upstream (unless marked ❌).
 | 1 backend | ❌ | divergence (friend stays Firebase) |
 | 2 WS adapter | ⚠️ partial | interface + firebase extract ✅, WS ❌ |
 | 3 characterization tests | ✅ | if storage-agnostic |
-| 4 dead-not-skipped | ✅ | beneficial feature |
+| 4 BUG-5 rotation fix | ✅ | bug fix |
 | 5 docker compose | ❌ | divergence |
 | 6 undo rework | ⚠️ partial | turn-logic-level ✅, events table ❌ |
 | 7 playwright | ✅ | if test infra shared |